Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/21305#discussion_r200824532
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -2120,6 +2122,99 @@ class Analyzer(
}
}
+ /**
+ * Resolves columns of an output table from the data in a logical plan.
This rule will:
+ *
+ * - Reorder columns when the write is by name
+ * - Insert safe casts when data types do not match
+ * - Insert aliases when column names do not match
+ * - Detect plans that are not compatible with the output table and
throw AnalysisException
+ */
+ object ResolveOutputRelation extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ case append @ AppendData(table: NamedRelation, query, isByName)
--- End diff --
Yes, I agree.
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